Ray-filter.



C2048 0R 111511245l J. T. CLARKEl RAY FILTER.

APPLICATION FILED JUNE l. 19H.

UNTTED sTATEs PATENT OFFICE.

JOSEPH TEACHER CLARE., OF HARBOW, ENGLAND, ASSIGNOB. TO EASTMAN KODAKCOMPANY, 0F ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

RAY-FILTER.

Specication of Letters Patent.

Patented Aug. 24, 1915.

Application led J' une 1, 1914. Serial No. 842,161.

To all whom 'it may concern Be it known that I, JOSEPH TEACHER CLARKE,of Harrow, England, have invented certain new and useful Improvements inRay-Filters; and I do hereby declare the following to be a full, clear,and exact description of the same, reference being had to theaccompaifying drawings, forming a part of this spec cation, and to thereferencenumerals marked thereon.

My present invention relates to photography and more particularly tohotographic cameras and it has for its object to provide a simple, neatand convenient form of ray lilter attachment for the lens tubes ofcameras, which may be easily and quickly removed from, or applied tolens tubes of the ordinary forms and by means of which light admitted tothe lens is filtered through a colored screen whereby its actinic effectis controlled for well known purposes.

A further object of the invention is to provide a filter device orholder in which the ltering screen is removably held so that it may betaken off at will without, if desired, removing the holder or a screenof another intensity substituted therefor.

To these and other ends the invention consists in certain improvementsand combinations of parts, all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specication.

In the drawings, Figure 1 is a front elevation of a ray ilterconstructed in accordance with and illustrating one embodiment of myinvention, the same being shown in operative position on a lens tube.Fig. 2 is a vertical sectional view taken substantially on the line 2 2of Fig. 1. Fig. 3 is a rear elevation of the holder detached and withthe screen removed. Fig. 4 is a section taken substantially on the line4 4 of Fig. 3. Fig. 5 is a top plan view, and Fig. 6 is a horizontalsection taken substantially on the line 6-,6 0f Fig. 3.

Similar reference numerals throughout the several views indicate thesame parts.

In the present embodiment of the invention, my ray filter attachmentcomprises two rectangular sheet metal frames A and B. The outer, andwhat I may term the main frame A has a central opening 1 as large as thelens and lens tube of the camera, such parts being shown conventionallyin Figs. 1

and 2 at 2 and 3, respectively, mounted on a lens board 4. The verticaledges of the main frame plate are flanged rearwardly at 5 or beaded toconstitute parallel guides embodylng an inwardly turned interlockingflange or shoulder 6. The inner frame B is also anged rearwardly at 7along its vertical edges to occupy and slide in the guides 5 inengagement with the interlocking fiange 6.

aid frame is also provided with a central opening 8 of about the size ofthe opening 1 in the frame A and the two openings come into and out ofregister with each other when the frames are moved relatively. Coilsprings 9 housed within the Hanged guides 5 tend to move the frames andhence the openings therein out of register in the relative positionsshown in Fig. 3. For this purpose, one end of each spring is connectedto an inwardly turned ear 10 at the upper extremity of the guide 5 whilethe other end is connected to a laterally turned ear at the lowerextremity of the adjacent fla-nge 7 so that the springs as well as thelast mentioned flanges are housed within the guides 5 of the main frameA.

At the upper side of the opening 1 in the frame A are two rearwardlyturned lugs 11 that may be struck up from the material of the plate onthe margin of the opening. Opposite to these lugs are two similar lugs12., on the lower margin of the opening 8 in the movable frame B, bothsets of lugs being preferably covered with rubber tubing or otherwiserendered non-abrasive. It will be seen that the two sets of lugs arearranged in opposition and move toward and from each other as the platesmove relatively and the openings therein move into and out of register.

The screen or ray lter proper that it is n the object to place over theend of the lens tube may consist of a colored glass plate 13. A seat isformed for this plate in the present instance by langing forwardly theupper and lower or horizontal edges of the frame plate A as at 14. Theglass may be inserted in or withdrawn from its seat from one side of theframe which is open for this purpose at 15 while at the o posite sidethe seat is closed against the rther passage of the screen by projectinabutments 16. Thus, similar screens, di ering, however, in ray filteringproperties m' be interchanged in the seat or remov easily for intoregister and the lugs 1l and 12 respec tively forced apart against thetensions of the springs 9 by placing the tips of the fingers beneath thelower edge of the plate A and pushing with the thumb on a thumb piece 18formed by a forwardly turned iiange at the top of the frame B. The saidlugs are then passed over the end of the lens tube and the framesreleased whereupon the action of the springs in tending to force theframes apart again will cause the lugs to grip the lens tubes onopposite sides in the manner of clamping jaws and retain the ray lterholder in place thereon. Thus the screen 13 will cover the lens at theend of the tube and light admittedto the lens must rst pass through thescreen.

It will be seen that the attachment may be as readily removed by muchthe same operation though the screens may be interchanged withoutrequiring such removal.

The device is light and compact being very thin overall, and in thepresent embodiment can be stamped from sheet material and easilyassembled at small cost.

I claim as my invention:

1. A ray filter comprising two relatively movable frames adapted to gripa lens tube, one of said frames being arranged to carry a screen infixed relation thereto.

2. A ray filter comprising two relatively movable frames guided one uponthe other and having jaws adapted to engage respectively upon oppositesides of a lens tube,

one of the frames being provided with a relatively iixed screen arrangedto cover the end of such lens tube.

3. A ray lter comprising two relatively movable frames guided one uponthe other to move into and out of register, and to grip a lens tubebetween them when in register, one of said members being a screencarrying frame, of a spring tending to move the frames out of registerand exert a gripping pressure on the lens tube.V

4. In a ray filter, the combination with a screen carrying frame havinglateral guides and a central opening and lens tube engaging jaws at oneside of the opening, of a second frame guided in the irst and providedwith lens tube engaging jaws opposite those.`

on the screen frame and a. spring acting upon the frames to operate therespective jaws toward each other.

5. In a ray lter, the combination with a frame having a central openingand provided with a screen seat on one face, and lens tube engaging jawsprojecting from the other face, of a second frame arranged on the lastmentioned face of the first frame and guided on the latter to moverelatively thereto, lens tube engaging jaws on said second framearranged opposite to those on the first and a spring acting upon theframes to move the respective sets of jaws toward each other.

6. In a ray filter, the combination with a screen carrying framecomposed of an apertured plate having flanged edges forming guides, andhaving gripping portions adapted toV engage one side of alens tube, of amovable frame having flanged edges cooperating with the anged edges ofthe screen carrying frame as guides, gripping portions on the movableframe arranged opposite to those on the first and a spring acting uponthe frames to move the respective sets of jaws toward each other.

7. In a ray filter, the combination with a screen carrying framecomposed of an apertured plate having flanged edges forming guides, andhaving gripping portions adapted to engage one side of a lens tube, of amovable frame having flanged edges coperating with' theiianged edges ofthe screen carrying frame as guides, gripping portions on the movableframe arranged opposite to those on the first and springs housed withinthe flanged guides of the .screen carrying frame and acting upon the,

frames to move the respective sets of jaws toward each other. 8. A raylter comprising two relatively movable gripping` members adapted toengage a lens tube one of said members embodying an a ertured plate, twoopposite edges of which are flanged rearwardly to rovide guides for theother grippin memlider, while the other two opposite e ges of said plateare flanged forwardly to provide a seat for a screen positioned acrossthe aperture and the end of a lens tube on which the filter is engaged.

JOSEPH THACHER CLARKE. Witnesses:

H. D. JAMESON, O. J. WORTH.

Copies ot this patent may be obtained for ve cents eaehLby addressingthe Commissioner et Patents. Washington, D. 0.-

